小直徑薄壁螺紋管的成型研究.pdf

1、西安建筑科技大學碩士學位論文小直徑薄壁螺紋管的成型研究姓名：鄭春生申請學位級別：碩士專業(yè)：材料加工工程指導教師：譚樹青2001.6.1西安建筑科技大學碩士學位論文ResearchofFormingSmalldiameter&thinwallSpiralTubesSpecialty：MaterialsProcessEngineeringStudent：ZhengChunshengInstructor：ProfTanShuqingABSTR

2、ACTInthefieldofheattransferring，thereisatendencyofgreatacquirementfortubeswimhigh—efficiencyheattransferring，andspiraltubesarespeciallydesignedaccordinglyAtthesametimeheattransferringequipmentanditscorepart一一tubeshavetoh

3、avethefollowingcharacters：smalldiameter，thinwallandhighefficiencySmall—diameter&thin—wallspiraltubeshasbeenconsideredasasolutiontothetendencyTheaimofthispaperistesearchandformspiraltubeswithfacilitatingmethodsFirst，thisp

4、aperintroducestheresearchingstatebothinhomeandabroad；atthesametimeheattransferringmechanismofspiraltubesisalsodiscussed；Thenseveralpresentformingmethodsareintroduced，accompaniedwithanewsetoftechniqueroutinewhichhasbeenca

5、lledas‘‘rotatingdepression”；Inthethirdpart，theforrningprocessisanalyzedandthemechanicalformulaateestablished，stabilityandpossibilityofformingprocessarealsotalkedaboutinthispart；Theexperimentalprocessisintroducedanddataar

6、eacquiredfromexperimentsinthelastpart；theinfluenceofsuchformingprocessparametersasrotatingspeedofrotatingformingdieandspiralangleofproductisalsodiscussedMathematicsmodelofexperimentalparametersisalsoestablishedinthispart